public class homework3_1 {
    public static void main(String[] args)
    {
        int a=10;
        int b=20;
        System.out.print("a+b=");
        System.out.println(a+b);
        System.out.println("a-b="+(a-b));
        System.out.println("a*b="+(a*b));
        System.out.println("a/b="+(a/b));
        System.out.println("a%b="+(a%b));
        System.out.println("a++="+(a++));
        System.out.println("--b="+(--b));
    }
}